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Daniel C. Tsui

physical science Maturity 9-11 Next article →

Daniel Chee Tsui is a highly influential American physicist. His research focuses on the electrical properties of thin films and microstructures. He also studies semiconductors and the complex field of solid-state physics. These studies help us understand how matter behaves at an incredibly small scale. Tsui is most famous for his groundbreaking work with quantum fluids. This work changed how scientists view the movement of particles in specific environments.

Tsui’s most significant scientific achievement is the discovery of the fractional quantum Hall effect. In 1982, while working at Bell Laboratories, he and Horst L. Störmer discovered this phenomenon. This discovery revealed a new form of quantum fluid. This fluid contains what are known as fractionally charged excitations. These excitations are special parts of the fluid that carry only a fraction of an electron's charge. In 1983, Robert B. Laughlin provided the theoretical interpretation for this discovery. This combination of experimental discovery and theoretical explanation was vital for science.

Tsui’s research involves the physics of two-dimensional electrons. Instead of studying mainstream topics like optics, he focused on how electrons act in thin layers. In these two-dimensional spaces, electrons behave in ways that are different from our everyday world. This specific area of study led directly to his Nobel Prize. He spent 28 years as a faculty member at Princeton University. He joined the department of electrical engineering and computer science in February 1982. He eventually reached emeritus status at Princeton in 2010.

Tsui’s path to scientific greatness began in a very different environment. He was born on February 28, 1939, in Fanzhuang, Henan, Republic of China. His parents were part of a Chinese agricultural family and were illiterate. His early years were shaped by the Second World War. He remembers his childhood being filled with droughts, floods, and war. These hardships were part of daily life in his over-populated village. His journey from a small village to global science is quite remarkable.

His formal education required him to move many times. In 1951, he moved to Hong Kong to attend Pui Ching Middle School. He initially struggled because he was not familiar with the Cantonese dialect. In 1957, he was admitted to the National Taiwan University Medical School. However, he chose to stay in Hong Kong to prepare for university entrance exams. In 1958, he received a full scholarship to Augustana College in the United States. He arrived in America just after Labor Day in 1958. He graduated Phi Beta Kappa in 1961.

Tsui pursued advanced studies at the University of Chicago. He earned his Ph.D. in physics in 1967. His doctoral dissertation was titled "de Haas-van Alphen effect and electronic band structure of nickel." He worked under the supervision of Royal Stark. Tsui chose this university because of famous physicists like C. N. Yang and T. D. Lee. Both of these men were Nobel laureates who had studied at Chicago. While studying there, he met and later married Linda Varland.

His scientific contributions have been recognized with many prestigious awards. In 1998, he won the Nobel Prize in Physics. He shared this honor with Robert B. Laughlin and Horst L. Störmer. He also received the Benjamin Franklin Medal in Physics in 1998. Other honors include the Oliver E. Buckley Condensed Matter Prize in 1984. He is a member of the U.S. National Academy of Sciences. He is also a Fellow of the American Physical Society. These honors reflect his massive impact on the world of physics.

Beyond the laboratory, Tsui has been an active voice in the scientific community. In May 2008, he was one of 20 American Nobel laureates to sign a letter. This letter was addressed to President George W. Bush. The scientists urged him to reverse damage to basic science research. They requested more funding for the National Science Foundation and the Department of Energy. Tsui has also held positions at Columbia University and Boston University. His life connects the worlds of deep theoretical physics and public scientific advocacy.

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